Cocking mechanism



Dec, 137 1949 w. SUMMERBELL COOKING MECHANISM Filed Sept. 2l, 1944 TOL William EummErbEll v Gum/wmp' Patented Dec. 1117i,Y 1949 CCKING MECHANISM William Summerbell, Washington, D. C.; Edith May Summerbell, deceased Application September 21, 1944, Serial No. 555,157

(Granted underV the act 0f March 3, 1883, as

2 Claims.

The invention described herein may be manufaotured and used by or for the Government for governmental purposes without the payment to me of any royalty thereon.

This invention relates to a cooking mechanism for guns oi the semi-automatic type having a vertically sliding breeohblock, and is an improvement upon the cooking mechanism described in my Patent No. 2,279,352, granted April 14, 1942.

The particular improvement contemplated comprises adding manually operated means to the structure of the cooking mechanism of the patent whereby the ring mechanism may be cocked from the side of the gun in case of misiire. These means include a cam member pivotally mounted on the breech ring of the gun, adapted to rook the camming lever by means of an attached handle. In the mechanism described in the aforementioned patent, the gun could be manually cocked after a misre only by pushing on the nose of the cooking lever from the rear of the gun to rotate the lever on its pivot. This was not only a difficult task, but an extremely dangerous one due to the possibility of premature ring of the live projectile in the gun. This new cam member serves a double purpose in also providing a camming surface for the cooking lever in normal cooking of the gun during recoil and counter recoil, permitting elimination of the plunger member shown in Figure 8 of the .I

patent. Y

A principal object of my invention is to provide manually operable means for cooking a gun having a vertically sliding breechblock from the side of the gun.

An important object of my invention is to provide means on the breech ring of a gun having an opening in which the breechblock is mounted to slide vertically which cooperates with the cocking mechanism enclosed in said breeohblook to manually oook said gun after misre from the side of the gun.

A further object of my invention is to provide simplied means on the breech ring of a gun having a breechblock slidably mounted therein to urge the cooking lever of said gun upward during the closing of the breech.

Another object of my invention is to provide in a gun having a -breeohblock enclosing a iiring mechanism and a breech ring having an opening in which said breech ring is slidably mounted, a cooking mechanism which is automatically operated by the vertical movement of said breechblock in opening and closing the breech of said gun but which can be operated manually from Summerbell executrix of said William amended April 30, 1928; 370 O. G. 757) the side of the gun outside the breechblock in case of misre, independently of the operation of said breeohblock.

Still another object of my invention is to provide manually-operated means for cooking a gun having a vertically slidable breechblock which is ineifzpensive to manufacture, simple to install on the guniieliable in its function and safe to operate.

For a more complete understanding of the invention, reference may be had vto the'following description oigan embodiment thereof, and to the drawing, ofiwhioh 1 Fig. 1 isa-'fragmentary end elevational view of a breech mechanism, a portion being broken away to show in section.

Fig. 2 is a side elevation of the same, portions of the ringfga-nd block being broken away.

Fig. 3 isaview similar to that in Fig. 2, but showing the action of the automatic cooking de- Vice. 'n..

Fig. 4 issimilar to Figure 3 except that it shows the action 'ofthe hand cooking device.

In the drawing abreech ring l0 of a gun is shown, within which a breechblock I2 is vertically slidabler-, The block carries a firing mechanism comprisingu'ha' iiring pin I4 housediin a firing pin guide l5. the guide being pressed by a suitable internal spring 49 in the usual `manner. The iiring mechanism is removably heldin place in the block by Sai retainer I8 secured inthe 'block by a bayonet joint connection. The ,iiring pin and its guide are held in cocked position by a sear 20 which engages a. bottom lug 22on the guide I6 and ridingfin slot I5. To release 'the iiring pin,

the sear 20 is pushed inwardffagainst its spring 2l by a plunger 2l which extends through the wall of the ring I0 and is pressed by any suitable trigger mechanism (not shown). For automatically cooking the tiring pin and guide, a cooking lever 3l) is rockably mounted Lon the breeohblook l2. As indicated in Figs. 1 and 2, the cooking lever comprises an upwardly projecting arm 32 having a nose 34, a downwardly extending arm 36 having a lateral extension 31 at its lower extremity, and an intermediate shaft portion 38 which is cylindrical and ts into a corresponding recess in the block. The extension 31 of the lower arm 36 projects through an aperture 39 in the block to engage a lateral lug 40 on the firing pin guide so as to move the guide and pin to cooked position when the cooking lever 30 is rocked in a clockwise direction as shown in Fig. 2. Such rocking movement-is brought about, when the breechblock I2 descends from its elevated breech.

eficacia closing position toward its breech-opening position, by the engagement of the nose 34 on a cam member 42 which is mounted on the breech ring I0, this action being illustrated in Fig. 3. As the block descends further to open,l the breech Afully, the nose rides 01TV the cam 42 sind gages any ininer face 43 of the ring I0, and th 's'a'relieves the cooking lever of the pressure of the firing pin:` spring. As the block I2 thereafter rises to its breech closing position, an inclined endtsifae *44 and rocks the cooking leverfijfritil on the cam member. This rocking movement 1s against the pressure of a spring-pressedplunger 45 which tends to hold the n'se"'3"4 ''i'erg'agennt "1o on the upper arm 32 engagesthe cam member 42"n automatically in response to translation of said breechblock to open position, said manually operable means being operable to pivot said cam member and, by engagement of said cam member with said cam portion, to pivot said cooking lever andthereby cock said firing pin while said breechblock is in closed position.y

2. In a gun, a breech ring, a breechblock slida-ble in said breech ring transversely of the bore airis of said gun, a firing pin slidably mounted in said breech ring from a first cocked position tovafsc'ondiiring position, a double-armed cockl ing lever fulcrumed in said breechblock and pivwith the cam member 42 or the surface-43,d by

pressure on shoulder 50.

It is sometimes desirable-moebel: @emananout opening the breech, as forekalnplef, after'a misre. To this endfthe cam member 42 is VIno'i'irit'ed on a shaft 46 'which-,isl-journalled in a 4breech ring adjacent saidbe'ecliblock;manually operable means externally ymounted -on'fsai'd breech ringvand directly connectedlwithjsaid 'jcarn niember 'to pivot'the same, a -cockin'g'levrpivotediin saidy breechblock and having a rstportioningagving ysaid ring pin to retrltthei'slrieagainst the action ofV said springmear'is, 4sa cockin'glevr 'alsoj'having a cam portion ienga'gnig'A said am membensaid cam portion enga'girgftlie'fcamfmem-i Aber,"without movementbf the' 6am member; to pivot said cocking'lever and oocklsidrngpin :block is closed.

otable to cause one arm to engage and retract isaidiringepin'from;second to rst position, and meansfor pivoting said lever in response to sliding of said breechblock to open position, said mean'slfc'omprisin'gashaft journaled in one side 'wallo'saidringya cam member fixed to one end of said shaft for engagement with the other arm Yof said-cooking lever as the breechblock slides to open position, a manually operable handle Xed'to the -other end of said shaft eXteriorly of said breechblook, said cooking lever 'being pivoted to cock said ring pin either 'by sliding movement of said other arm over and -in Contact With said cam lmember as saidk breechblock is opened, or by 'pivotal movement of said cam member in response to turning of'said -handle While said'bree'chi- WILLIAM SUMMERBELL;

REFEENCES -orr'nn Tli'following references `are of record in the ule Of this patent:

UN'ITD STATES --PATENIS Number 

